卫星导航抗干扰算法研究及系统设计

发布时间：2018-06-16 22:51

本文选题：卫星导航 + 抗干扰　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：目前,卫星导航技术在国民经济和军事领域已经得到广泛应用。然而,地面和空中接收到的卫星信号非常微弱,完全淹没在噪声之中。因此,卫星导航接收机很容易受到来自外界的有意或无意的干扰,从而不能正常工作。因此研究具有抗干扰能力的卫星导航接收系统就显得尤为重要。本文首先介绍了卫星导航抗干扰算法的研究背景以及发展状况,分析了常用的几种抗干扰技术的特点。重点研究了两种空域自适应抗干扰算法,即最小均方算法(LMS)和递归最小二乘算法(RLS)。针对LMS算法和RLS所存在的问题,提出了改进。仿真并分析了改进后的LMS算法和RLS算法的性能,比较了两种算法的干扰抑制能力、复杂度、收敛性能。最终,选用以白噪声为参考的RLS算法进行硬件实现。其次,建立了抗干扰实验所采用的硬件平台,并进行了抗干扰实验。本文建立的接收机抗干扰系统采用的是数字零陷中频输出天线系统结构。论文描述了该系统的天线阵列模块、射频模块和数字信号处理模块的主要功能和性能指标,并给出了系统平台硬件程序的实现。通过实际测试验证了该系统和抗干扰算法能够有效工作,抑制干扰。最后,针对宽带抗干扰需求,研究了GPS接收机空时抗干扰技术。论文给出了空时自适应抗干扰模型,研究了线性约束最小方差(LCMV)算法和基于Frost结构的空时最小均方(FLMS)算法。在此基础上,通过仿真分析和验证了FLMS算法抑制宽带干扰和窄带干扰的性能。
[Abstract]:At present, satellite navigation technology has been widely used in the national economy and military fields. However, satellite signals received on the ground and in the air are very weak and completely submerged in noise. Therefore, the satellite navigation receiver is vulnerable to intentional or unintentional interference from the outside world, so it can not work properly. Therefore, it is very important to study the satellite navigation receiving system with anti-jamming ability. This paper first introduces the research background and development status of anti-jamming algorithms for satellite navigation, and analyzes the characteristics of several commonly used anti-jamming techniques. Two spatial adaptive anti-jamming algorithms, the least mean square algorithm (LMS) and the recursive least square algorithm (RLSU), are studied in this paper. Aiming at the problems of LMS algorithm and RLS, the improvement is put forward. The performance of the improved LMS algorithm and the RLS algorithm is simulated and analyzed, and the interference suppression ability, complexity and convergence performance of the two algorithms are compared. Finally, the RLS algorithm with white noise as the reference is selected for hardware implementation. Secondly, the hardware platform of anti-interference experiment is established, and anti-interference experiment is carried out. The receiver anti-jamming system in this paper adopts the digital zero-trapping intermediate frequency output antenna system structure. This paper describes the main functions and performance indexes of the antenna array module, RF module and digital signal processing module of the system, and gives the implementation of the hardware program of the system platform. The test results show that the system and the anti-jamming algorithm can work effectively and suppress interference. Finally, the space-time anti-jamming technology of GPS receiver is studied according to the requirement of wide-band anti-jamming. The space-time adaptive anti-jamming model is presented in this paper. The linear constrained minimum variance LCMV (LCMV) algorithm and the space-time minimum mean square (FLMS) algorithm based on Frost structure are studied. On this basis, the performance of FLMS algorithm to suppress wideband interference and narrowband interference is analyzed and verified by simulation.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1;TN973

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